Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7d398e0b8c6a9b…

MALICIOUS

PDF

69.2 KB Created: 2021-02-09 08:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 907cd11c1b416350e5d1617fe7f1b373 SHA-1: 6d16dd67a4706ed10f2eafaa7a0a6224a94a125c SHA-256: 3c7d398e0b8c6a9be1d525fa33194079bef91524cd55493367c6a7e155386631
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the PDF as part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wb?keyword=basic%20electronics%20engineering%20textbook%20pdf PDF link annotation
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/7897028.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/xhahehf/weekend_weather_forecast_for_philadelphia_pa.pdfIn PDF document text
    • http://brosbass.com/wumugekkgi3w.pdfIn PDF document text
    • http://detonic-ordina.website/temple_run_2_lost_jungle_unlockds1h6.pdfIn PDF document text
    • http://fixmarker.fun/58982366764ay2zc.pdfIn PDF document text
    • http://oneplusonemain.xyz/favibolopite62a4p.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/easy_bing_maps_er_7._25v3l74.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/hhAicib/football_coach_shirt_controversy.pdfIn PDF document text
    • http://flymoney.net/52289373286v38kj.pdfIn PDF document text
    • http://molotkov.site/622286470743d6c9.pdfIn PDF document text
    • http://canonsburglake.com/45167602046m30u5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fff97e818ffc.pdfIn PDF document text
    • http://gezoxapawelu.22web.org/81338089449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukokikedusej.epizy.com/kigegefipe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 5644 bytes
SHA-256: 1c9a700b5e5cb06ff229b9631d039c7f172043d24b0789acb0f391250bef86d5
font_01_sfnt_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 11164 bytes
SHA-256: 9a5a7a6ec2ffd380228b78d5810199cfb75fb78f2dc5ec745bfe4fb2142c5806

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